Synthesis and properties of Bis(3,5-dimethyl-4-amino phenyl)-4′- methoxy phenyl methane based polymerization of monomeric reactants type polyimide and its composites

Publication

Publication

Polymerization of Monomeric Reactants (PMR) type of polyimide was prepared using bis(3,5-dimethyl-4-amino phenyl)-4′-methoxy phenyl methane and characterized by elemental analysis, FT-IR, 1H NMR, and 13C NMR spectral techniques. Differential scanning calorimetry (DSC) analysis shows that melting and curing take place in the temperature range of 215 to 230 C and 265 to 315 C respectively. The uncured and cured prepolymer undergo two step (335 and 583 C) and single step (537 C) decomposition respectively. The T10% and char yield at 800 C were found to be 465 C and 46 wt %, respectively. FT-IR and thermogravimetric analysis (TGA) of the heat treated resin powder and prepolymer reveal that imidization takes place in the temperature range 250-275 C and cross-linking occurs between 275 and 325 C. The prepolymer was found to undergo photocross-linking. The flexural strength, flexural modulus, and interlaminar shear strength of carbon fiber (T300) reinforced BA4MPM-PMR type composite are 447 MPa, 34 GPa, and 42 MPa, respectively.